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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd7b8c8b5b4550c7482a2b721a03effa9257ff65b1dd9bb218a41dc0b396a71d' 
  AND token = 'CXKN2jwiwxT+3UEeoWnZPlm822af4YVAbHOQLl8TinI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}